MT#55283 defuse error message

This can be an expected condition

NGCP-Flow: mr14.1
Change-Id: Ib4514e97a3faf45e2a52a3372b59e1c09d8f3176

daemon/media_socket.c

@@ -1639,7 +1639,11 @@ static const char *kernelize_target(kernelize_state *s, struct packet_stream *st
 	if (!handler->in->kernel)
 		return "protocol not supported by kernel module";
 
-	handler->in->kernel(&reti->decrypt, stream);
+	int ret = handler->in->kernel(&reti->decrypt, stream);
+	if (ret) {
+		ilog(LOG_NOTICE, "SRTP not yet negotiated");
+		return NULL;
+	}
 	if (!reti->decrypt.cipher || !reti->decrypt.hmac)
 		return "decryption cipher or HMAC not supported by kernel module";